Browsing by Type "article"
Now showing items 1-20 of 2667
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1.55 Å-resolution structure of ent-copalyl diphosphate synthase and exploration of general acid function by site-directed mutagenesis
(Elsevier, 2014)Background The diterpene cyclase ent-copalyl diphosphate synthase (CPS) catalyzes the first committed step in the biosynthesis of gibberellins. The previously reported 2.25 Å resolution crystal structure of CPS complexed ... -
1/f Noise in doped and undoped amorphous silicon
(Elsevier, 2000-05)We measured the spectrum of conductance fluctuations in n-type, p-type, and undoped hydrogenated amorphous silicon (a-Si:H) as a function of temperature. In general, the spectra can be fit to a power law, 1/fα, although ... -
1/f-noise study of undoped intrinsic hydrogenated amorphous silicon thin films
(American Physical Society, 1999)Conductance fluctuations in four samples of undoped intrinsic hydrogenated amorphous silicon (a-Si:H) were measured in the temperature range of 450 K to 500 K and for frequencies from 2 Hz to 3 kHz. The noise spectra divide ... -
1/Nc expansion and anomaly cancellation in the presence of electroweak interactions
(Institute of Physics Publishing, 1998-03)We study the question of a consistent formulation of the 1/Nc expansion in the presence of electroweak interactions. We show that in some cases the previous formulation leads to an unrealistic picture. We improve the scheme. ... -
2-D analysis of Ge implanted SiO2 surfaces by laser-induced breakdown spectroscopy
(Elsevier, 2008-10)2-D elemental distribution of Ge in silicon oxide substrates with differing implantation doses of between 3 × 1016 cm- 2 and 1.5 × 1017 cm- 2 has been investigated by Laser-Induced Breakdown Spectroscopy (LIBS). Spectral ... -
2D vibrational properties of epitaxial silicene on Ag(111)
(IOP Publishing, 2017-03)The two-dimensional silicon allotrope, silicene, could spur the development of new and original concepts in Si-based nanotechnology. Up to now silicene can only be epitaxially synthesized on a supporting substrate such as ... -
5-Fluorouracil signaling through a calcium-calmodulin-dependent pathway is required for p53 activation and apoptosis in colon carcinoma cells
(Nature Publishing Group, 2013-09)5-Fluorouracil (5-FU) is an anti-metabolite that is in clinical use for treatment of several cancers. In cells, it is converted into three distinct fluoro-based nucleotide analogs, which interfere with DNA synthesis and ... -
6-Bicycloaryl substituted (S)- and (R)-5,6-dihydro-2H-pyran-2-ones: Asymmetric synthesis, and anti-proliferative properties
(Elsevier, 2009-01)(R)-Goniothalamin, is a member of styryl lactones, possesses selective cytotoxicity against cancer cell lines. In this work, replacement of styryl substituent with 2-naphthyl and 3-quinoyl gave new analogues which may have ... -
A1-L10 phase boundaries and anisotropy via multiple-order-parameter theory for an fcc alloy
(European Mathematical Society Publishing House, 2003)The dependence of thermodynamic properties of planar interphase boundaries (IPBs) and antiphase boundaries (APBs) in a binary alloy on an fcc lattice is studied as a function of their orientation. Using a recently developed ... -
AAS, XRPD, SEM/EDS, and FTIR characterization of Zn2+ retention by calcite, calcite–kaolinite, and calcite–clinoptilolite minerals
(Elsevier, 2005-04-08)In this study, the sorption behavior of Zn2+ on calcite, kaolinite, and clinoptilolite, in addition to mixtures of calcite with kaolinite and clinoptilolite, was investigated at various loadings and mixture compositions ... -
The Ablowitz-Ladik lattice system by means of the extended (G′ / G)-expansion method
(Elsevier, 2010-07)We analyzed the Ablowitz-Ladik lattice system by using the extended (G′ / G)-expansion method. Further discrete soliton and periodic wave solutions with more arbitrary parameters are obtained. We observed that some previously ... -
Absence of pseudogap in heavily overdoped Bi2Sr2CaCu2O8+δ from tunneling spectroscopy of break junctions
(Institute of Physics Publishing, 2002-05)We report tunneling spectroscopy of superconductor-insulator-superconductor break junctions on heavily overdoped Bi2Sr2CaCu2O8+δ with Tc = 56 K. At T ≪ Tc, the junction conductances display well-defined quasiparticle peaks ... -
Absence of superoxide dismutase activity causes nuclear DNA fragmentation during the aging process
(Elsevier, 2014-02)Superoxide dismutases (SOD) serve as an important antioxidant defense mechanism in aerobic organisms, and deletion of these genes shortens the replicative life span in the budding yeast Saccharomyces cerevisiae. Even though ... -
Absolute co-supplement and absolute co-coclosed modules
(Hacettepe Üniversitesi, 2013)A module M is called an absolute co-coclosed (absolute co-supplement) module if whenever M ≅ T/X the submodule X of T is a coclosed (supplement) submodule of T. Rings for which all modules are absolute co-coclosed (absolute ... -
Absolute properties of the binary system BB pegasi
(American Astronomical Society, 2007-08)We present ground-based photometry of the low-temperature contact binary BB Peg. We collected all the times of mid-eclipse available in the literature and combined them with those obtained in this study. Analyses of the ... -
Absolutely s-pure modules and neat-flat modules
(Taylor & Francis, 2015-02)Let R be a ring with an identity element. We prove that R is right Kasch if and only if injective hull of every simple right R-modules is neat-flat if and only if every absolutely pure right R-module is neat-flat. A ... -
Absorption spectrum of monomeric pseudoisocyanine: A new perspective and its implications for formation and spectral response of J-aggregates in solution and in thin films
(Elsevier, 2008-05)We argued against the current spectral assignment for absorption spectrum of monomeric PIC which is widely accepted since the pioneering works of Scheibe and Jelley [G. Scheibe, Angew. Chem. 49 (1936) 563; E.E. Jelly, ... -
The accelerating effects of the microorganisms on biodeterioration of stone monuments under air pollution and continental-cold climatic conditions in Erzurum, Turkey
(Elsevier, 2006-07)The aim of this research was to determine the accelerating effects of microorganisms on the biodeterioration of stone under air pollution and continental-cold climatic region in Erzurum, Turkey. Studies have been carried ... -
Acclimation to heat during incubation. 2. Embryo composition and residual egg yolk sac fatty acid profiles in chicks
(Poultry Science Association, 2008-06)The aim of the research was to evaluate embryo composition and changes in egg yolk fatty acid composition during embryonic development as a function of incubation temperature and age of breeders. Eggs obtained from a common ... -
Accounting for product similarity in software project duration estimation
(World Scientific Publishing, 2016-02-01)We extend an existing model proposed for estimating project duration for industrial projects in general, to software intensive systems projects. We show, through nine different cases studies from different sectors, that ...
